character:
Bacillus subtilis is a species of Bacillus genus. Single cell size of 0.7~0.8 × 2~3 microns, with uniform staining. No capsule, peri flagella, able to move. Gram positive bacteria, spores 0.6~0.9 × 1.0-1.5 microns, elliptical to columnar, located in the center or slightly off center of the bacterial body, do not swell after spore formation. The surface of the colony is rough and opaque, with a dirty white or slightly yellow color. When growing in liquid culture medium, it often forms wrinkled aerobic bacteria. Protein, various sugars, and starch can be utilized to decompose tryptophan into indole. Widely used in genetic research, the synthesis pathway and regulatory mechanism of purine nucleotides in this bacterium are well understood. Widely distributed in soil and decaying organic matter, it is easy to reproduce in the juice of dried grass, hence the name Bacillus subtilis.
Some strains are important producers of alpha amylase and neutral protease; Some strains have enzyme systems that strongly degrade nucleotides, so they are often used as parent strains for breeding nucleoside producing bacteria or strains for producing 5 '- nucleases.